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## lastruneprog
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### Instructions
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Write a program that receives a `string` and returns the last `rune` of a `string`.
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### Expected output :
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```console
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student@ubuntu:~/piscine-go/firstruneprog$ go build
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student@ubuntu:~/piscine-go/firstruneprog$ ./firstruneprog "this is not happening"
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g
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student@ubuntu:~/piscine-go/firstruneprog$ ./firstruneprog "hello" | cat -e
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o$
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student@ubuntu:~/piscine-go/firstruneprog$ ./firstruneprog "this" "is" "not" "happening"
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student@ubuntu:~/piscine-go/firstruneprog$
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student@ubuntu:~/piscine-go/firstruneprog$ ./firstruneprog
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student@ubuntu:~/piscine-go/firstruneprog$
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```
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